WO2016189857A1

WO2016189857A1 - Information display apparatus

Info

Publication number: WO2016189857A1
Application number: PCT/JP2016/002505
Authority: WO
Inventors: 直宏栗原; 勝一石川
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2015-05-28
Filing date: 2016-05-24
Publication date: 2016-12-01
Also published as: JP2018119998A

Abstract

Provided is an information display apparatus whereby cost and development time are reduced, high contrast is obtained, and visibility can be enhanced. This information display apparatus is provided with: an optical device for controlling the transmitted amount of light incident from a back surface side and forming, on a display surface on a front surface side, an image including an information display region and a background region comprising a black image outside the information display region; and an optical member disposed on the front surface side or the back surface side of the optical device. At least one optical member has a light-blocking part for blocking light that corresponds to the background region.

Description

Information display device

The present disclosure relates to an information display device that displays various types of information on a black background, and more particularly, to an information display device mounted on a vehicle.

In recent years, in order to improve the safety of vehicles, in-vehicle display devices that collectively display various information such as images around the vehicle, map information, and speed information are becoming widespread. For this reason, the size of the display has increased, and the proportion of the display in the vehicle dashboard has increased. This also means that the influence of the display on the interior of the vehicle is expanding.

Such an in-vehicle display device is required to have high contrast and high visibility. However, in the case of an in-vehicle display device including a liquid crystal panel as an optical device, even if black display is performed, there is usually light leakage from the liquid crystal panel. Therefore, when various information such as a speedometer is displayed on a black background, the contrast is lowered and the visibility is deteriorated. In addition, when the display surface of the in-vehicle display device is arranged in the dashboard, the black display appears to float around the interior of the vehicle, especially the inner panel (inner panel) based on black. End up. That is, the black background of the in-vehicle display device and the black around the internal panel are not assimilated. Here, “black display” means a black display that appears on the display surface when the power of the in-vehicle display device is turned on, and “black background” means that the black display is displayed. This is the background when it is the background of a face.

On the other hand, for example, Patent Literature 1 discloses a technique for suppressing luminance in the display surface. In Patent Document 1, in a direct backlight device used in a liquid crystal display device, a plurality of LED (Light Emitting Diode) light sources are arranged at a predetermined pitch, and each area or LED light source is selected according to an image to be displayed. It is disclosed to perform local dimming control for controlling the light emission luminance for each.

JP 2013-143239 A

However, the liquid crystal display device disclosed in Patent Document 1 described above has a problem that the cost and the development period are increased as compared with the case where the surface light source is a backlight as in the edge light method or the direct type.

An object of the present disclosure is to provide an information display device that can reduce the cost and the development period, and can improve visibility with high contrast.

An information display device according to an aspect of the present disclosure controls an amount of transmission of light incident from the back side to display an image including an information display region and a background region including a black image other than the information display region on the front side And an optical member disposed on the front side or the back side of the optical device. At least one of the optical members has a configuration including a light shielding portion that blocks light corresponding to the background region.

According to the information display device according to the present disclosure, the cost and the development period can be suppressed, and the visibility can be improved with high contrast.

The figure which shows an example of the display surface of the liquid crystal display which concerns on Embodiment 1 of this indication The figure which shows the field in the display surface of the same liquid crystal display Exploded perspective view schematically showing the configuration of the liquid crystal display The figure which shows the shading sheet of the same liquid crystal display typically Enlarged schematic diagram of the light shielding sheet when the transition area of the light shielding sheet of the liquid crystal display is formed with a dot pattern Enlarged schematic diagram of the light-shielding sheet when the transition region of the light-shielding sheet of the liquid crystal display is formed with a light and shade pattern FIG. 4 is an exploded perspective view schematically showing a configuration of a liquid crystal display according to Embodiment 2 of the present disclosure. An exploded perspective view schematically showing a configuration of a liquid crystal display according to Embodiment 3 of the present disclosure. Schematic diagram showing a configuration of a projection display device according to a fourth embodiment of the present disclosure Schematic diagram showing the configuration of the head-up display according to the fifth embodiment of the present disclosure. Schematic diagram showing a configuration of a liquid crystal display according to Embodiment 6 of the present disclosure The figure which shows the example of the display part of the liquid crystal display which concerns on Embodiment 6 of this indication The figure which shows the example of the light-shielding part of the liquid crystal display which concerns on Embodiment 6 of this indication The figure which shows the example of the other display part of the liquid crystal display which concerns on Embodiment 6 of this indication The figure which shows the example of the other light-shielding part of the liquid crystal display which concerns on Embodiment 6 of this indication

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. However, in the embodiment, components having the same function are denoted by the same reference numerals, and redundant description is omitted.

(Embodiment 1)
FIG. 1 is a diagram illustrating an example of a display surface of the liquid crystal display 10 according to the first embodiment of the present disclosure. A liquid crystal display 10 shown in FIG. 1 is an in-vehicle display device mounted on a vehicle, for example. The liquid crystal display 10 includes a tachometer 11 indicating the engine speed, a speedometer 12 indicating the speed of the vehicle, a fuel meter 13 indicating the remaining fuel, a water temperature meter 14 indicating the coolant temperature of the engine, and a shift range 15. Is displayed.

The display surface of the liquid crystal display 10 specialized for such display is divided into regions as shown in FIG. In FIG. 2, white portions W1 to W5 are information display regions for displaying various types of information shown in FIG. 1, and dark gray portions B are background regions (hereinafter referred to as “information display regions W (W1 to W5)”. Referred to as “background region B”). That is, the image displayed on the liquid crystal display 10 includes information display areas W1 to W5 and a background area B made up of a black image other than the information display areas W1 to W5. Note that the types of information displayed on the liquid crystal display 10 and the shapes of the information display areas W1 to W5 are not limited to those described above. 1 and 2 are also applied to Embodiments 2 to 6 described later.

FIG. 3 is an exploded perspective view schematically showing the configuration of the liquid crystal display 10 according to Embodiment 1 of the present disclosure. The liquid crystal display 10 is a transmissive liquid crystal display having an edge light type backlight. In FIG. 3, the left side of the paper is the display surface side of the liquid crystal display 10, that is, the front side, and the right side of the paper is the back side of the liquid crystal display 10.

As shown in FIG. 3, the liquid crystal display 10 includes a light guide plate 21, a light source 22, optical sheets 23 to 26, a polarizing plate 27, a liquid crystal panel 28, a polarizing plate 29, and a light shielding sheet 30. The arrangement of the optical sheets 23 to 26, the polarizing plate 27, the liquid crystal panel 28, the polarizing plate 29, and the light shielding sheet 30 is as follows.

That is, the optical sheet 23, the optical sheet 24, the optical sheet 25, the optical sheet 26, the polarizing plate 27, the liquid crystal panel 28, the polarizing plate 29, and the light shielding sheet 30 are provided in order from the back side. The liquid crystal panel 28 constitutes the optical device of the present disclosure. The light guide plate 21, the optical sheets 23 to 26, the polarizing

plates

27 and 29, and the light shielding sheet 30 constitute the optical member of the present invention.

The light guide plate 21 is, for example, a plate made of polycarbonate, and is formed of a substantially rectangular parallelepiped having a smooth flat surface on all surfaces, and uniformly transmits light incident on the light guide plate 21.

The light source 22 is disposed on the end surface of the light guide plate 21. The light source 22 is disposed so that light enters the light guide plate 21. The light source 22 is, for example, a plurality of white LEDs, and lights up while the liquid crystal display 10 is powered on.

The optical sheet 23 is a reflection sheet disposed so as to overlap the back surface of the light guide plate 21, and reflects light emitted from the back surface of the light guide plate 21 toward the front surface.

The optical sheet 24 is a diffusion sheet disposed so as to overlap the front surface of the light guide plate 21 and diffuses light irradiated from the front surface of the light guide plate 21.

The optical sheet 25 is a prism sheet disposed so as to be superimposed on the front surface of the optical sheet 24, and makes the brightness of the light transmitted through the optical sheet 24 uniform.

The optical sheet 26 is a diffusion sheet disposed so as to overlap the front surface of the optical sheet 25 and diffuses light transmitted through the optical sheet 25.

The polarizing plate 27 is a polarizing plate disposed so as to be superimposed on the front surface of the optical sheet 26 and transmits only a unidirectional component (for example, a horizontal component) of the light transmitted through the optical sheet 26.

The liquid crystal panel 28 (corresponding to an optical device) sandwiches the liquid crystal between two alignment films, turns on / off the voltage applied to the liquid crystal panel, and changes the alignment pattern of the liquid crystal to change the polarizing plate 27. The transmitted light is transmitted while changing its vibration direction or transmitted without changing its vibration direction.

The polarizing plate 29 is arranged so as to have a transmission axis direction that is 90 ° different from the transmission axis direction of the polarizing plate 27, and transmits only one direction component (for example, vertical component) of the light transmitted through the liquid crystal panel 28. Let

The light shielding sheet 30 is disposed so as to overlap the front surface of the polarizing plate 29, and blocks light corresponding to the background region B (see FIG. 2). The light shielding sheet 30 is obtained by forming a light shielding mask 31 having the same shape as the background region B on a resin sheet such as an overhead projector (OHP) sheet or a polyethylene terephthalate (PET) sheet. The light shielding mask 31 is formed by printing black ink on a portion corresponding to the background region B.

For this reason, the light shielding sheet 30 can be easily applied according to the shape of the information display area W. That is, even when the design of the image displayed for each vehicle type is different, a liquid crystal display having the same structure can be used by simply changing the light shielding sheet 30 as appropriate. The light shielding sheet 30 may be a remaining portion obtained by cutting out a portion corresponding to the information display area of the liquid crystal display from the black sheet.

Here, the light shielding sheet 30 is arranged so as to overlap the front surface of the polarizing plate 29. However, the light shielding sheet 30 is composed of the optical sheet 23, the light guide plate 21, the optical sheet 24, the optical sheet 25, and the optical sheet 26. Alternatively, the polarizing plate 27 and the liquid crystal panel 28 may be arranged so as to overlap each other.

When the light shielding sheet 30 is disposed on the front side of the light guide plate 21, the degree of blurring of the boundary between the information display area W and the background area B of the liquid crystal display 10 increases. Conversely, when the light shielding sheet 30 is disposed on the back side of the light guide plate 21, the boundary between the information display area W and the background area B of the liquid crystal display 10 is cleared.

Moreover, since the optical member is laminated on the front side as the light shielding sheet 30 is provided at a position closer to the back surface (light source), the degree of blurring of the boundary between the information display region W and the background region B of the liquid crystal display 10 increases. . On the other hand, as the light shielding sheet 30 is provided closer to the front surface (a position farther from the light source), the light shielding effect becomes higher, and the boundary between the information display area W and the background area B of the liquid crystal display 10 becomes clearer.

FIG. 4 shows a schematic diagram of a preferred example of the light shielding sheet 30. As shown in FIG. 4, the light shielding sheet 30 preferably has light transmittance between a light shielding region 32 (dark gray portion) which is a light shielding portion and a light transmitting region 33 (outlined portion). A transition region 34 (light gray portion) that is intermediate between the region 32 and the translucent region 33 is provided. Even when the information display area W of the liquid crystal display 10 and the light-transmitting area 33 of the light shielding sheet 30 do not completely match due to an attachment error or the like, this mismatch is absorbed by the transition area 34, so that natural display and Become.

FIG. 5 shows an enlarged view when the transition region 34 in the light shielding sheet 30 is formed in a dot pattern. Further, FIG. 6 shows an enlarged view when the transition region 34 in the light shielding sheet 30 is formed in a shade pattern. 5 and 6, the light shielding region 32 is hatched. As shown in FIG. 5, the transition region 34 provided between the light shielding region 32 and the light transmitting region 33 has a dot pitch or a dot diameter that decreases from the light transmitting region 33 toward the light shielding region 32. The dot pattern may be formed so as to be large. Further, as shown in FIG. 6, the transition area 34 is formed with a light and shade pattern so that the light shielding density gradually increases (including binary values) from the light transmitting area 33 toward the light shielding area 32. But you can.

As described above, the liquid crystal display 10 according to the first embodiment controls the transmission amount of light incident from the back side, and includes an information display area W and a background area B including a black image other than the information display area W. Is provided on the display surface on the front side. Furthermore, the liquid crystal display 10 of Embodiment 1 includes a light guide plate 21, an optical sheet 23, an optical sheet 24, an optical sheet 25, an optical sheet 26, a polarizing plate 27, a polarizing plate 29, and a light shielding sheet 30 (the front surface of the liquid crystal panel 28). Optical member disposed on the side or back side). The light shielding sheet 30 (at least one of the optical members) has a light shielding region 32 that blocks light corresponding to the background region B.

According to the first embodiment, by providing the light shielding sheet 30 having a light shielding portion having a shape matched to the background region B of the liquid crystal display 10, the light shielding sheet 30 blocks the light of the backlight. The luminance of the background region B of the liquid crystal display 10 can be reduced without reducing the luminance of the region. Therefore, since a high-contrast image can be displayed, visibility is significantly improved.

Also, the black display that is the background area of the liquid crystal display 10 and the black surrounding the inner panel can be assimilated. Further, it is realized by a simple process of printing black ink on the optical member to form the light shielding portion, and the structure of the existing liquid crystal display can be used as it is, so that the cost and the development period can be suppressed.

In the present embodiment, the case where the light shielding sheet 30 is provided separately from the optical member originally provided in the liquid crystal display 10 has been described. However, the present invention is not limited to this, and the optical sheet 23, the light guide plate 21, and the optical sheet 24 are provided. The light shielding portion may be provided on any one or a combination of optical members of the optical sheet 25, the optical sheet 26, and the polarizing plate 27. However, when the light guide plate 21 is provided with a light shielding portion, the light shielding portion is provided on the front surface or the back surface of the light guide plate 21. In the case where the light blocking portion is provided on the polarizing plate 27, the light blocking portion is provided on the front surface, the back surface, or the layer of the polarizing plate 27.

(Embodiment 2)
FIG. 7 is an exploded perspective view illustrating a configuration of the liquid crystal display 40 according to the second embodiment of the present disclosure. The liquid crystal display 40 is a transmissive liquid crystal display having a direct type backlight. In FIG. 7, the left side of the paper is the display surface of the liquid crystal display 40, that is, the front side, and the right side of the paper is the back side of the liquid crystal display 40. 7 differs from FIG. 1 in that a diffusion plate 42 is added, the light guide plate 21 is deleted, and the light source 22 is changed to a light source 41.

As shown in FIG. 7, the liquid crystal display 40 includes a light source 41, optical sheets 23 to 26, a diffusion plate 42, a polarizing plate 27, a liquid crystal panel 28, a polarizing plate 29, and a light shielding sheet 30. The arrangement of the optical sheets 23 to 26, the diffusion plate 42, the polarizing plate 27, the liquid crystal panel 28, the polarizing plate 29, and the light shielding sheet 30 is as follows.

That is, the optical sheet 23, the diffusion plate 42, the optical sheet 24, the optical sheet 25, the optical sheet 26, the polarizing plate 27, the liquid crystal panel 28, the polarizing plate 29, and the light shielding sheet 30 are provided in order from the back side. The liquid crystal panel 28 constitutes the optical device of the present disclosure. The diffusion plate 42, the optical sheet 23, the optical sheet 24, the optical sheet 25, the optical sheet 26, the polarizing plate 27, the polarizing plate 29, and the light shielding sheet 30 constitute the optical member of the present disclosure.

The light source 41 is disposed on the surface of the optical sheet 23 disposed on the rearmost surface. The light source 41 is, for example, a plurality of white LEDs, and lights up while the liquid crystal display 40 is powered on.

The diffusion plate 42 is disposed so as to overlap the front surface of the optical sheet 23 and diffuses light emitted from the light source 41 and light reflected by the optical sheet 23.

The light shielding sheet 30 is not limited to be superimposed on the front surface of the polarizing plate 29 on the front side, and the optical sheet 23, the diffusion plate 42, the optical sheet 24, the optical sheet 25, the optical sheet 26, and the polarizing plate 27. The liquid crystal panel 28 may be disposed so as to overlap the front surface.

As described above, according to the second embodiment, in the transmissive liquid crystal display having the direct type backlight, as in the first embodiment, the light shielding sheet having the light shielding portion shaped to match the background region B of the liquid crystal display. By providing 30, the light shielding sheet 30 blocks the light of the backlight, so that the brightness of the background area of the liquid crystal display 40 can be reduced without reducing the brightness of the information display area of the liquid crystal display 40. Therefore, since a high-contrast image can be displayed, visibility is significantly improved.

Also, the black display, which is the background area of the liquid crystal display, can be assimilated with the black surrounding the instrument panel. Further, it is realized by a simple process of printing black ink on the optical member to form the light shielding portion, and the structure of the existing liquid crystal display can be used as it is, so that the cost and the development period can be suppressed.

In the present embodiment, the case where the light shielding sheet 30 is provided separately from the optical member originally provided in the liquid crystal display 10 has been described. However, the present invention is not limited thereto, and the optical sheet 23, the diffusion plate 42, and the optical sheet 24 are provided. The light shielding portion may be provided on any one or a combination of optical members of the optical sheet 25, the optical sheet 26, and the polarizing plate 27. However, when a light shielding part is provided on the diffusion plate 42, the light shielding part is provided on the front surface or the back surface of the diffusion plate 42.

(Embodiment 3)
FIG. 8 is an exploded perspective view illustrating a configuration of the liquid crystal display 50 according to the third embodiment of the present disclosure. The liquid crystal display 50 is a reflective liquid crystal display. In FIG. 8, the left side of the paper is the display surface of the liquid crystal display 50, that is, the front side, and the right side of the paper is the back side of the liquid crystal display 50.

As shown in FIG. 8, the liquid crystal display 50 includes a polarizing plate 51, a liquid crystal panel 52, a light shielding sheet 53, and a reflecting optical member 54 in order from the front side. The liquid crystal panel 52 constitutes the optical device of the present disclosure. The polarizing plate 51, the light shielding sheet 53, and the reflecting optical member 54 constitute an optical member of the present disclosure.

The polarizing plate 51 transmits only one direction component (for example, horizontal direction component) of the external light 55 such as sunlight.

The liquid crystal panel 52 (corresponding to an optical device) sandwiches the liquid crystal between two alignment films, turns on / off the voltage applied to the liquid crystal panel, and changes the alignment pattern of the liquid crystal to change the polarizing plate 51. The transmitted light is transmitted while changing its vibration direction or transmitted without changing its vibration direction.

The light shielding sheet 53 is disposed so as to overlap the back surface of the liquid crystal panel 52 and blocks light corresponding to the background region B (see FIG. 2). The light shielding sheet 53 is obtained by forming the light shielding mask 31 having the same shape as the background region B on a resin sheet such as an overhead projector (OHP) sheet and a polyethylene (terephthalate phthalate) sheet. The light shielding mask 31 is formed by printing black ink on a portion corresponding to the background region B.

The light shielding sheet 53 is not limited to be placed on the back surface of the liquid crystal panel 52 but may be placed on the front surface of any one of the polarizing plate 51, the liquid crystal panel 52, and the reflecting optical member 54. Good.

The reflection optical member 54 reflects the light transmitted through the light shielding sheet 53.

In the liquid crystal display 50, a light-shielding portion is provided in one or a combination of the polarizing plate 51 and the reflecting optical member 54 among the optical members constituting the liquid crystal display 50. In addition, when the light-shielding part is provided in the polarizing plate 51, the light-shielding part is provided in the front surface of the polarizing plate 51, a back surface, or a polarizing plate layer.

As described above, according to the third embodiment, also in the reflective liquid crystal display, as in the first embodiment, by providing the light shielding sheet 53 having the light shielding portion having the shape matched to the background region B of the liquid crystal display 50, Since the light shielding sheet 53 blocks light, the black luminance of the background area of the liquid crystal display 50 can be reduced without reducing the luminance of the information display area of the liquid crystal display 50. Therefore, since a high-contrast image can be displayed, visibility is significantly improved.

Also, the black display as the background area of the liquid crystal display 50 and the black surrounding the instrument panel can be assimilated. Further, it is realized by a simple process of printing black ink on the optical member to form the light shielding portion, and the structure of the existing liquid crystal display can be used as it is, so that the cost and the development period can be suppressed.

The reflective liquid crystal display according to this embodiment has been described by taking an example of monochrome display. However, color display may be performed. In this case, a color filter is inserted between the polarizing plate and the liquid crystal panel. In the present invention, the color filter may be provided with a light shielding portion.

In the present embodiment, the case where the light shielding sheet 53 is provided separately from the optical member originally provided in the liquid crystal display 50 has been described. However, the present disclosure is not limited thereto, and the optical properties of the polarizing plate 51 and the reflecting optical member 54 are not limited thereto. The light shielding portion may be provided on any single member or a plurality of combinations of optical members.

(Embodiment 4)
FIG. 9 is a schematic diagram illustrating a configuration of the projection display device 60 according to the fourth embodiment of the present disclosure. The projection display device 60 is a 3LCD (Liquid Crystal Display) type projector. In FIG. 9, the left side of the drawing is the irradiation side of the projection display device 60, that is, the front side, and the right side of the drawing is the back side of the projection display device 60.

As shown in FIG. 9, the projection display device 60 includes a light source 61, a liquid crystal optical unit 62, a light shielding sheet 63, a projection lens 64, and the like in order from the back side. The liquid crystal optical unit 62 constitutes an optical device of the present disclosure. The light source 61, the light shielding sheet 63, and the projection lens 64 constitute an optical member of the present disclosure.

The light source 61 is, for example, a high-pressure discharge lamp such as an HID (High Intensity Discharge) lamp.

The liquid crystal optical unit 62 (corresponding to an optical device) separates colors after condensing light from the light source 61 by the light source optical system in accordance with the adoption of the 3LCD type configuration.

The light shielding sheet 63 is disposed immediately after the liquid crystal optical unit 62, and blocks light corresponding to the background region B (see FIG. 2). The light shielding sheet 63 is obtained by forming a light shielding mask 31 having the same shape as the background region B on a resin sheet such as an OHP sheet and a PET sheet. The light shielding mask 31 is formed by printing black ink on a portion corresponding to the background region B.

A part of the light emitted from the liquid crystal optical unit 62 is blocked by the light shielding sheet 63 and projected onto the screen by the projection lens 64, whereby an image is enlarged and projected on the screen.

As described above, according to the fourth embodiment, the projection display device 60 is also provided with the light shielding sheet 63 having the light shielding portion having a shape corresponding to the background region B of the projection display device 60 as in the first embodiment. Accordingly, since the light shielding sheet 63 blocks light, the black luminance of the background region of the screen can be reduced without reducing the luminance of the information display region of the screen. Therefore, since a high-contrast image can be displayed, visibility is significantly improved.

Also, the black display, which is the background area of the screen, can be assimilated with the black surrounding the instrument panel. Further, it is realized by a simple process of printing black ink on the optical member to form a light shielding portion, and the structure of the existing projection display device can be used as it is, so that the cost and the development period can be suppressed. .

(Embodiment 5)
FIG. 10 is a schematic diagram illustrating a configuration of the head-up display 70 according to the fifth embodiment of the present disclosure.

10, the head-up display 70 includes a display unit 71, a light shielding sheet 72, a projection lens 73, a mirror 74, and a combiner 75. The display unit 71 constitutes the optical device of the present disclosure. The light shielding sheet 72, the projection lens 73, the mirror 74, and the combiner 75 constitute an optical member of the present disclosure.

The display unit 71 (corresponding to an optical device) is constituted by, for example, a transmissive liquid crystal display panel, and can display visible information that the head-up display 70 should display. Visible information displayed by the display unit 71 is illuminated by a backlight arranged in the vicinity thereof and projected as an image of light. That is, the image of the light emitted from the display unit 71 is projected onto the combiner 75 via the light shielding sheet 72, the projection lens 73, and the mirror 74, and is reflected by the surface of the combiner 75 to be a predetermined observation position of the driver. Head to eyepoint EP1.

Since the reflection of light by the surface of the combiner 75 is used, the display image seen at the position of the eye point EP1 is a virtual image as if it exists at a predetermined position ahead of the combiner 75 and the window glass of the vehicle. Is displayed.

The combiner 75 is composed of a combiner body and a film. The combiner body is configured in a plate shape using an optically transparent material. As a specific example, an acrylic resin can be used as a material. Further, the combiner body has a sufficient thickness so that bending and deformation do not occur.

The film is made of a transparent material having a refractive index equivalent to that of the combiner body. For example, a film can be comprised using a polycarbonate. The thickness of the film is sufficiently thinner than the combiner body. A film is arrange | positioned so that it may overlap with one surface of a combiner main body.

The light shielding sheet 72 is disposed between the display unit 71 and the projection lens 73, and blocks light corresponding to the background region B (see FIG. 2). The light shielding sheet 72 is obtained by forming a light shielding mask having the same shape as the background region B on a resin sheet such as an OHP sheet and a PET sheet. The light shielding mask is formed by printing black ink on a portion corresponding to the background region B.

The light shielding sheet 72 is not limited to be disposed between the display unit 71 and the projection lens 73, and may be disposed so as to overlap the front surface of the mirror 74, or between the display unit 71 and the projection lens 73. , And may be disposed on the front surface of the mirror 74.

As described above, according to the fifth embodiment, in the head-up display 70, as in the first embodiment, the light shielding sheet 72 having the light shielding portion having the shape matched to the background region B of the combiner 75 is provided. Since the sheet 72 blocks light, the brightness of the background area of the combiner 75 can be reduced without reducing the brightness of the information display area of the combiner 75. Therefore, since a high-contrast image can be displayed, visibility is significantly improved.

Also, the black display that is the background area of the combiner 75 and the black surrounding the instrument panel can be assimilated. Further, it is realized by a simple process of printing black ink on the optical member to form the light shielding portion, and the structure of the existing liquid crystal display can be used as it is, so that the cost and the development period can be suppressed.

In the present embodiment, the light image is projected onto the combiner. However, the present disclosure is not limited to this, and the light image may be projected onto the window glass of the vehicle instead of the combiner. .

(Embodiment 6)
FIG. 11 is a schematic diagram illustrating a configuration of the liquid crystal display 80 according to the sixth embodiment of the present disclosure. The liquid crystal display 80 is a curved liquid crystal display with a curved display surface. In FIG. 11, the display surface of the liquid crystal display 80 is curved in a convex shape, but may be curved in a concave shape. The liquid crystal display 80 according to the present embodiment is different from the first and second embodiments in that it has a curved shape and the shape of a display area and a light shielding portion described below. Other configurations are the same as those of the first embodiment or the second embodiment.

When the liquid crystal panel is bent, display unevenness (light leakage) due to stress may occur locally. Such display unevenness (light leakage) is particularly likely to occur around the screen (four corners and edges). FIG. 11 schematically shows a state where such light leakage has occurred. On the display surface shown in FIG. 11, although black images are displayed uniformly, black floating due to light leakage 35 occurs at the four corners.

Therefore, in the liquid crystal display according to the present embodiment, black floating is prevented by forming light shielding portions at least in the corners of the display surface.

12A and 12B show an example of the display surface of the liquid crystal display 80 and an example of the shape of the light shielding part, respectively. The information display area W is arranged at the center of the display surface, and the background area B which is a black image is arranged at the four corners of the display surface. The light shielding area 32 of the light shielding portion has the same shape as the background area B of the display surface.

13A and 13B show other examples of the shape of the display surface and the light shielding part, respectively. The information display area W is arranged at the center of the display surface, and the background area B that is a black image is arranged at the end of the display surface so as to surround the information display area W. Also in this example, the light shielding area 32 of the light shielding section has the same shape as the background area B of the display surface.

In the light shielding part according to the present embodiment, a transition region may be provided between the light shielding region 32 and the light transmitting region 33 as described in the first embodiment.

In each of the above embodiments, the in-vehicle display device has been described as an example. However, the present disclosure is not limited to this, and any information display device may be used.

In each of the above embodiments, the liquid crystal panel has been described as an example of an optical device. However, the present disclosure is not limited to this, and other than forming an image by controlling the transmission amount of light incident from the back side. These devices may be optical devices. For example, even in a display using a MEMS (Micro Electro Mechanical System) shutter, a similar effect can be expected by providing a light shielding portion corresponding to a region where the shutter is off.

The information display device according to the present disclosure is useful for reducing the cost and the development period and improving the visibility with high contrast, and is particularly applicable to an in-vehicle display.

10, 40, 50, 80 Liquid crystal display 21

Light guide plate

22, 41, 61

Light source

23, 24, 25, 26

Optical sheet

27, 29 Polarizing

plate

28, 52

Liquid crystal panel

30, 53, 63, 72 Light shielding sheet 31 Light shielding mask 32 Light-shielding area 33 Light-transmitting area 34 Transition area 35 Light leakage 42 Diffusion plate 51 Polarizing plate 54 Optical member for reflection 55 External light 60 Projection display device 62 Liquid crystal optical section 64 Projection lens 70 Head-up display 71 Display section 73 Projection lens 74 Mirror 75 Combiner

Claims

An optical device that controls a transmission amount of light incident from the back side to form an image including an information display region and a background region made of a black image other than the information display region on a display surface on the front side;
An optical member disposed on the front side or the back side of the optical device,
At least one of the optical members has a light shielding portion that blocks light corresponding to the background region,
Information display device.
The optical device is a liquid crystal panel;
The information display device according to claim 1.
The information display device is any one of a transmissive liquid crystal display having an edge-light type backlight, a transmissive liquid crystal display having a direct type backlight, a reflective liquid crystal display, a projection display device, and a head-up display. ,
The information display device according to claim 1.
The information display device according to claim 1, wherein the light shielding portion is provided at a position closer to the back surface than the display surface.
The light shielding portion is provided at a position closer to the display surface than the back surface.
The information display device according to claim 1.
The optical member having the light shielding portion has a light transmittance between the light shielding region and the light transmitting region between the light shielding region that blocks the light and the light transmitting region that transmits the light. A transition region is provided,
The information display device according to claim 1.
The transition region has a lower light transmittance as it goes from the light-transmitting region to the light-shielding region.
The information display device according to claim 6.
The display surface of the optical device is curved in a convex shape or a concave shape, and the background region and the light shielding portion are formed at least at the corners of the display surface.
The information display device according to claim 1.